In 1455, the pope granted which nation a monopoly on the atlantic slave trade?

It was Portugal. Pope Nicholas V issued the Romanus Pontifex papal bull in January 8, 1455, declaring that Portugal had the sole right over trade, fishing and navigation upon their newly discovered lands, stretching from the northern coast of Africa to India. It also held that the purchase of african people was deemed legal by his authority.  

lend lease program was passed by congress on march 11, 1941. the president could ship weapons, food, or stuff to any country whose struggle against the axis assisted u.s. defense